Assembly of Two 3D Porous Metal–Organic Frameworks Based on 1,2,3-Triazole-4,5-dicarboxylate Exhibiting Novel Coordination Modes

Two novel metal–organic frameworks (MOFs) |(H3O)1.5(H2O)3|[Cd2K0.5(C4N3O4)2(H2O)] (1) and |(H3O)­(H2O)|[Cu4(C4N3O4)3(H2O)3] (2) were solvothermally synthesized using 1,2,3-triazole-4,5-dicarboxylic acid (H3tzdc), which exhibited novel and diverse coordination modes. In compound 1, the ligand, which shows three novel types of coordination modes, is coordinated to cadmium atoms to generate a tetranuclear cluster that leads to a 5-connected bnn network with two distinct channels along the [001] and [010] directions. In compound 2, the ligand, which serves as a T-shaped linker, is coordinated to copper atoms to form a unique metalloporphyrin-like plane, resulting in a pto network without interpenetration. Gas adsorption was investigated for compound 1. In addition, a diverse blue luminescence response toward different guest molecules by compound 1 has been observed.